TetraKits
Add & subtract
ab ± cd = ad ± bcbd
Example: 1/2 + 1/3 = (3+2)/6 = 5/6
Fraction Calculator
Add, subtract, multiply, and divide fractions and mixed numbers with results in lowest terms. Enter values as proper fractions, improper fractions, or mixed numbers — see the simplified answer and decimal equivalent.
Read: Fraction Calculator Guide: Add, Subtract, Multiply & Divide →
- Free to Use
- No Signup
- Privacy Friendly
How to calculate with fractions
- 1
Choose an operation
Select add, subtract, multiply, or divide. Enter each fraction as numerator/denominator or mixed number.
- 2
Enter your fractions
Type values like 3/4, 1 1/2, or 5/6. The calculator finds common denominators for addition and subtraction.
- 3
Read simplified result
See the answer in lowest terms plus decimal form. For decimal-only math, use the scientific calculator.
Fraction Formulas
Multiply & divide
Multiply: a/b × c/d = ac/bd
Divide: a/b ÷ c/d = ad/bc
Results are automatically reduced to lowest terms using the greatest common divisor (GCD).
Why Use This Tool?
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Four Operations
Add, subtract, multiply, and divide any fractions.
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Auto Simplify
Results reduce to lowest terms automatically.
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Mixed Numbers
Enter whole numbers alongside numerators and denominators.
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Instant Results
Live updates as you type — no submit button needed.
Frequently Asked Questions
How do you add fractions with different denominators?
Find the least common denominator (LCD), convert both fractions, then add numerators. The calculator does this automatically.
Can I enter mixed numbers?
Yes. Enter whole number and fraction parts separately, or as a single mixed number like 2 3/4.
Are results always simplified?
Yes. The GCF reduces the result to lowest terms — 4/8 becomes 1/2.
What about dividing by zero?
A zero denominator is invalid. The calculator shows an error if you enter 0 in the denominator.
Is this fraction calculator free?
Yes. Unlimited operations with no signup.
Fraction Math Without Common Denominators
Recipe adjustments, construction measurements, and math homework routinely mix proper fractions, improper fractions, and mixed numbers. One calculator handles all four operations and simplifies to lowest terms automatically.
